XML 63 R51.htm IDEA: XBRL DOCUMENT
v3.25.3

Segment Information - Underwriting Margins and Combined Ratios for our Underwriting Operations (Detail) - Underwriting operations | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Segment Reporting Information [Line Items] |  |  |  |
Under- writing Margin | 10.50% | 11.00% | 12.70% | 10.90%
Combined Ratio | 89.50% | 89.00% | 87.30% | 89.10%
Operating Segments | Personal Lines |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Under- writing Margin | 10.50% | 10.90% | 12.90% | 11.00%
Combined Ratio | 89.50% | 89.10% | 87.10% | 89.00%
Operating Segments | Commercial Lines |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Under- writing Margin | 10.80% | 11.30% | 12.20% | 10.30%
Combined Ratio | 89.20% | 88.70% | 87.80% | 89.70%

X
- Definition Pretax underwriting profit loss expressed as a percentage of net premiums earned. + References No definition available. + Details
Name: | pgr_UnderwritingMargin
Namespace Prefix: | pgr_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Ratio of non-life losses and loss expenses, non-life acquisition expenses and non-life general and administrative expenses, to non-life net premiums earned. + References No definition available. + Details
Name: | us-gaap_CombinedRatio
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_ProductOrServiceAxis=pgr_UnderwritingOperationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ConsolidationItemsAxis=us-gaap_OperatingSegmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=pgr_PersonalLinesSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=pgr_CommercialLinesSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |